– 61 –
Main
remote
control
Check code
F13
F13
01: Compressor 1 side
02: Compressor 2 side
IPDU
TH sensor
trouble
All stop
Sensor resistance is infinity or zero
(open/short circuit).
• Defect in IPM built-in temperature
sensor
→
Replace A3-IPDU P.C. board.
F15
F15
—
I/F
Outdoor
temperature
sensor wiring
trouble (TE1,
TL1)
All stop
During compressor operation in
HEAT mode, TL1 continuously
provides temperature reading
higher than indicated by TL1 by at
least specified margin for 3 minutes
or more.
• Check installation of TE1 and TL1
sensors.
• Check resistance characteristics
of TE1 and TL1 sensors.
• Check for outdoor P.C. board
(I/F) trouble.
F16
F16
—
I/F
Outdoor
pressure
sensor wiring
trouble (Pd, Ps)
All stop
Readings of high-pressure Pd
sensor and lowpressure Ps sensor
are switched.
Output voltages of both sensors
are zero.
• Check connection of highpressure
Pd sensor connector.
• Check connection of lowpressure
Ps sensor connector.
• Check for defect in pressure
sensors Pd and Ps.
• Check for trouble in outdoor P.C.
board (I/F).
• Check for deficiency in
compressive output of
compressor.
F23
F23
—
I/F
Ps sensor
trouble
All stop
Output voltage of Ps sensor is zero. • Check for connection trouble
involving Ps sensor and Pd
sensor connectors.
• Check connection of Ps sensor
connector.
• Check for defect in Ps sensor.
• Check for deficiency in
compressive output of
compressor.
• Check for defect in 4-way valve.
• Check for defect in outdoor P.C.
board (I/F).
• Check for defect in SV4 circuit.
F24
F24
—
I/F
Pd sensor
trouble
All stop
Output voltage of Pd sensor is zero
(sensor open-circuited).
Pd > 4.15MPa despite compressor
having been turned off.
• Check connection of Pd sensor
connector.
• Check for defect in Pd sensor.
• Check for defect in outdoor P.C.
board (I/F).
F29
—
—
Indoor
unit
Other indoor
trouble
Stop of
corresponding
unit
Indoor P.C. board does not operate
normally.
• Check for defect in indoor P.C.
board (faulty EEPROM)
F31
F31
—
I/F
Outdoor
EEPROM
trouble
All stop *1
Outdoor P.C. board (I/F) does not
operate normally.
• Check power supply voltage.
• Check power supply noise.
• Check for defect in outdoor P.C.
board (I/F).
H01
H01
01: Compressor 1 side
02: Compressor 2 side
IPDU
Compressor
breakdown
All stop
Inverter current detection circuit
detects overcurrent and shuts
system down.
• Check power supply voltage.
(AC460V ± 10%).
• Check for defect in compressor.
• Check for possible cause of
abnormal overloading.
• Check for defect in outdoor P.C.
board (A3-IPDU).
H02
H02
01: Compressor 1 side
02: Compressor 2 side
IPDU
Compressor
trouble (lockup)
MG-CTT trouble
All stop
Overcurrent is detected several
seconds after startup of inverter
compressor.
• Check for defect in compressor.
• Check power supply voltage.
(AC460V ± 10%).
• Check compressor system wiring,
particularly for open phase.
• Check connection of connectors/
terminals on A3-IPDU P.C. board.
• Check conductivity of case heater.
(Check for refrigerant problem
inside compressor.)
• Check for defect in outdoor P.C.
board (A3-IPDU).
• Check outdoor MG-CTT.
H03
H03
01: Compressor 1 side
02: Compressor 2 side
IPDU
Current
detection
circuit trouble
All stop
Current flow of at least specified
magnitude is detected despite
inverter compressor having been
shut turned off.
• Check current detection circuit
wiring.
• Check defect in outdoor P.C.
board (A3-IPDU).
H05
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
MG-CTT: Magnet contactor
H05
—
I/F
TD1 sensor
miswiring
(incomplete
insertion)
All stop
Discharge temperature of
compressor 1 (TD1) does not
increase despite compressor being
in operation.
• Check installation of TD1 sensor.
• Check connection of TD1 sensor
connector and wiring.
• Check resistance characteristics
of TD1 sensor.
• Check for defect in outdoor P.C.
board (I/F).
Outdoor 7-segment display
Check
code
Sub-code
Location
of
detection
Description
System status
Trouble detection
condition(s)
Check items (locations)
F12
F12
01: TS1 sersor trouble
03: TS2 sersor trouble
I/F
TS1/TS2
sensor trouble
All stop
Sensor resistance is infinity or zero
(open/short circuit).
• Check connection of TS1/TS3
sensor connector.
• Check resistance characteristics
of TS1/TS3 sensor.
• Check for defect.
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